Triggered Star Formation and the Creation of the Supergiant HI Shell in IC 2574Based on deep imaging from the Advanced Camera for Surveys aboard the Hubble Space Telescope, we present new evidence that stellar feedback created a ~ 1 kpc supergiant HI shell (SGS) and triggered…Daniel R. Weisz, Evan D. Skillman, John M. Cannon et al.·Dec 10, 2008SaveLearn
Are red 2MASS QSOs young?We use photometric data from Spitzer to explore the mid- and far-IR properties of 10 red QSOs (J-K>2, R-K>5) selected by combining the 2MASS in the NIR with the SDSS at optical wavelengths. Optical…A. Georgakakis, D. L. Clements, G. Bendo et al.·Dec 10, 2008SaveLearn
A characteristic signature of fourth order gravityWe present for the first time the complete matter power spectrum for Rn gravity which has been derived from the fourth order scalar perturbation equations. This leads to the discovery of a…Kishore N. Ananda, Sante Carloni, Peter K. S. Dunsby·Dec 10, 2008SaveLearn
WINGS-SPE Spectroscopy in the WIde-field Nearby Galaxy-cluster SurveyAims. We present the results from a comprehensive spectroscopic survey of the WINGS (WIde-field Nearby Galaxy-cluster Survey) clusters, a program called WINGS-SPE. The WINGS-SPE sample consists of 48…A. Cava, D. Bettoni, B. M. Poggianti et al.·Dec 10, 2008SaveLearn
Essential observations of the Lyman continuumConcurrent observations of Lyman continuum (LyC) and Lyman-alpha (Lya) emission escaping from star-forming systems at low redshift are essential to understanding the physics of reionization at high…Stephan R. McCandliss·Dec 10, 2008SaveLearn
Toward understanding the 3.4 micron and 9.7 micron extinction feature variations from the local diffuse interstellar medium to the Galactic centerObservationally, both the 3.4micron aliphatic hydrocarbon C--H stretching absorption feature and the 9.7micron amorphous silicate Si--O stretching absorption feature show considerable variations from…Jian Gao, B. W. Jiang, Aigen Li·Dec 10, 2008SaveLearn
The 21 micron and 30 micron circumstellar dust features in evolved C-rich objectsThe 21micron and 30micron bands are the strongest dust emission features detected in evolved low- and intermediate-mass C-rich stars (i.e. asymptotic giant branch [AGB] stars, proto-planetary nebulae…B. W. Jiang, Ke Zhang, Aigen Li·Dec 10, 2008SaveLearn
The Spitzer c2d Survey of Nearby Dense Cores. V. Discovery of a VeLLO in the "Starless" Dense Core L328This paper reports the discovery of a Very Low Luminosity Object (VeLLO) in the "starless" dense core L328, using the Spitzer Space Telescope and ground based observations from near-infrared…Chang Won Lee, Tyler L. Bourke, Philip C. Myers et al.·Dec 10, 2008SaveLearn
Absolute Magnitude Distribution And Light Curves Of Gamma-Ray Burst SupernovaePhotometry data were collected from the literature and analyzed for supernovae that are thought to have a gamma-ray burst association. There are several gamma-ray burst afterglow light curves that…Dean Richardson·Dec 10, 2008SaveLearn
The Pervasive Role of the Nuclear Symmetry Energy in the Structure and Evolution of Neutron StarsThe multifaceted role of the density dependent nuclear symmetry energy in the nuclear astrophysics involving neutron stars is highlighted. Efforts toward a model independent determination of the…M. Prakash Pals·Dec 10, 2008SaveLearn
Potential-density pairs for a family of finite disksExact analytical solutions are given for the three finite disks with surface density Σn=σ0 (1-R2/α2)n-1/2 with n=0, 1, 2. Closed-form solutions in cylindrical co-ordinates are given…Earl Schulz·Dec 10, 2008SaveLearn
Disk reflection signatures in the spectrum of the bright Z-source GX 340+0We present the preliminary results of a 50 ks long XMM-Newton observation of the bright Z-source GX 340+0. In this Letter we focus on the study of a broad asymmetric emission line in the Fe K alpha…A. D'Ai, R. Iaria, T. Di Salvo et al.·Dec 10, 2008SaveLearn
Large-scale horizontal flows in the solar photosphere. IV. On the vertical structure of large-scale horizontal flowsIn the recent papers, we introduced a method utilised to measure the flow field. The method is based on the tracking of supergranular structures. We did not precisely know, whether its results…Michal Svanda, Mirek Klvana, Michal Sobotka et al.·Dec 10, 2008SaveLearn
Avoiding the dark energy coincidence problem with a cosmic vectorWe show that vector theories on cosmological scales are excellent candidates for dark energy. We consider two different examples, both are theories with no dimensional parameters nor potential terms,…Jose Beltran Jimenez, Antonio L. Maroto·Dec 10, 2008SaveLearn
Possible evidence for a common radial structure in nearby AGN toriWe present a quantitative and relatively model-independent way to assess the radial structure of nearby AGN tori. These putative tori have been studied with long-baseline infrared (IR)…Makoto Kishimoto, Sebastian F. Hoenig, Konrad R. W. Tristram et al.·Dec 10, 2008SaveLearn
MOST photometry of the enigmatic PMS pulsator HD 142666We present precise photometry of the pulsating Herbig Ae star HD 142666 obtained in two consecutive years with the MOST (Microvariability & Oscilations of STars) satellite. Previously, only a single…K. Zwintz, T. Kallinger, D. B. Guenther et al.·Dec 10, 2008SaveLearn
Analysis of the Hydrogen-rich Magnetic White Dwarfs in the SDSSWe have calculated optical spectra of hydrogen-rich (DA) white dwarfs with magnetic field strengths between 1 MG and 1000 MG for temperatures between 7000 K and 50000 K. Through a least-squares…Baybars Külebi, Stefan Jordan, Fabian Euchner et al.·Dec 10, 2008SaveLearn
The extrasolar planet atmosphere and exosphere: Emission and transmission spectroscopyWe have entered the phase of extrasolar planets characterization, probing their atmospheres for molecules, constraining their horizontal and vertical temperature profiles and estimating the…Giovanna Tinetti, Jean-Philippe Beaulieu·Dec 10, 2008SaveLearn
The Antarctic Impulsive Transient Antenna Ultra-high Energy Neutrino Detector Design, Performance, and Sensitivity for 2006-2007 Balloon FlightWe present a detailed report on the experimental details of the Antarctic Impulsive Transient Antenna (ANITA) long duration balloon payload, including the design philosophy and realization, physics…ANITA collaboration, P. Gorham, P. Allison et al.·Dec 10, 2008SaveLearn
Photodesorption of Ices II: H2O and D2OGaseous H2O has been detected in several cold astrophysical environments, where the observed abundances cannot be explained by thermal desorption of H2O ice or by H2O gas phase formation. These…Karin I. Oberg, Harold Linnartz, Ruud Visser et al.·Dec 10, 2008SaveLearn
Magnetic fields and cosmic rays in GRBs. A self-similar collisionless foreshockCosmic rays accelerated by a shock form a streaming distribution of outgoing particles in the foreshock region. If the ambient fields are negligible compared to the shock and cosmic ray energetics, a…Mikhail V. Medvedev, Olga V. Zakutnyaya·Dec 10, 2008SaveLearn
Tests of achromatic phase shifters performed on the SYNAPSE test bench: a progress reportThe achromatic phase shifter (APS) is a component of the Bracewell nulling interferometer studied in preparation for future space missions (viz. Darwin/TPF-I) focusing on spectroscopic study of…Pavel Gabor, Peter A. Schuller, Bruno Chazelas et al.·Dec 10, 2008SaveLearn
On the morphology of the compact dust shell in the symbiotic system HM SagittaeThe symbiotic system HM Sagittae consists of a Mira star and a secondary White Dwarf component. The dust content of the system was severely affected by the nova outburst in 1975, which is still…Stéphane Sacuto, Olivier Chesneau·Dec 10, 2008SaveLearn
Sources of contamination to weak lensing tomography: redshift-dependent shear measurement biasThe current methods available to estimate gravitational shear from astronomical images of galaxies introduce systematic errors which can affect the accuracy of weak lensing cosmological constraints.…Elisabetta Semboloni, Ismael Tereno, Ludovic van Waerbeke et al.·Dec 10, 2008SaveLearn
Infrared Studies of Molecular Shocks in the Supernova Remnant HB21: I. Thermal Admixture of Shocked H2 Gas in the NorthWe present near- and mid-infrared observations on the shock-cloud interaction region in the northern part of the supernova remnant HB21, performed with the InfraRed Camera (IRC) aboard AKARI…Jong-Ho Shinn, Bon-Chul Koo, Michael G. Burton et al.·Dec 10, 2008SaveLearn